package com.nowcoder.community.entity;

/**
 * @author 夏智力
 * @FileName Page
 * @date 2021/5/30 14:45
 * @Software: IntelliJ IDEA
 */


import lombok.Data;

/**
 *封装分页相关的信息
 */


public class Page {

    //  当前页码
    private int current = 1;
    //  显示上限
    private  int limit = 10;
    //  数据总数(用于计算总页数)
    private int rows;
    //查询路径(用于复用分页链接)
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if(current >= 1){
            this.current = current;
        }
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if(limit >=1 && limit < 100) {
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if(rows >= 0 ) {
            this.rows = rows;
        }
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    //获取当前页的起始行
    public int getOffset() {
        return (current-1) * limit;
    }

    //获取总页数
    public  int getTotal() {
        if(rows % limit  == 0){
            return rows / limit;
        }else
            return rows / limit + 1;
    }

    public int getFrom() {
        int from = current - 2;
        return from < 1 ? 1 : from;
    }

    public int getTo() {
        int to = current + 2;
        int total = getTotal();
        return to < total ? to : total;
    }
}
